OnFieldChangeTrait.php

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<?php
 
declare(strict_types=1);
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
namespace ‪TYPO3\CMS\Backend\Form\Behavior;
 
use ‪TYPO3\CMS\Core\Crypto\HashService;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
 
trait OnFieldChangeTrait
{
    protected function getOnFieldChangeItems(array $items): array
    {
        if (empty($items)) {
            return [];
        }
        return array_map(
            static function (OnFieldChangeInterface $item): array {
                return $item->toArray();
            },
            // omitting array keys
            array_values($items)
        );
    }
 
    protected function getOnFieldChangeAttrs(string $event, array $items): array
    {
        if (empty($items)) {
            return [];
        }
        $onFieldChangeItems = $this->getOnFieldChangeItems($items);
        return [
            'data-formengine-field-change-event' => $event,
            'data-formengine-field-change-items' => GeneralUtility::jsonEncodeForHtmlAttribute($onFieldChangeItems, false),
        ];
    }
 
    protected function forwardOnFieldChangeQueryParams(array $items): array
    {
        $func = $this->getOnFieldChangeItems($items);
        $hashService = GeneralUtility::makeInstance(HashService::class);
        return [
            'fieldChangeFunc' => $func,
            'fieldChangeFuncHash' => $hashService->hmac(serialize($func), 'backend-link-browser'),
        ];
    }
}